Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS7664731 B2
Publication typeGrant
Application numberUS 11/231,989
Publication dateFeb 16, 2010
Filing dateSep 22, 2005
Priority dateMar 21, 2002
Fee statusPaid
Also published asUS20060020575
Publication number11231989, 231989, US 7664731 B2, US 7664731B2, US-B2-7664731, US7664731 B2, US7664731B2
InventorsRobert F. Snapp, David J. Payne, James D. Wilson
Original AssigneeUnited States Postal Service
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and system for storing and retrieving data using hash-accessed multiple data stores
US 7664731 B2
Abstract
A method and system for storing and retrieving data using hash-accessed multiple data stores, provides data protection while requiring low computational overhead and further provides storage and retrieval access based on only a single piece of access information, which is generally public. The algorithms provide high security against data-mining and other examination of the data stores. The access information is hashed and is split into offset fields used as indices into a plurality of data stores, generating a quasi-random relationship between the access information and the location of portions of a stored data element. Further protection may be provided by striping the data across the data stores in conformity with a striping order selected by a field of the hashed access information.
Images(5)
Previous page
Next page
Claims(29)
1. A method, implemented using a computer system, for processing data comprising:
receiving an access record having a plurality of identifiers, the access record corresponding to an entity;
transforming, using the computer system, at least one of the plurality of identifiers in the access record into a pre-determined standard representation of the at least one of the plurality of identifiers;
utilizing a cryptographic algorithm to process, using the computer system, at least two of the plurality of identifiers in the access record, including the pre-determined standard representation, to form a cryptographic algorithm result corresponding to previously stored data related to the entity, wherein the previously stored data related to the entity was stored according to an output of the cryptographic algorithm;
matching, using the computer system, the cryptographic algorithm result with the previously stored data related to the entity;
if the cryptographic algorithm result matches the previously stored data related to the entity, outputting, using the computer system, a result indicating a match; and
if the cryptographic algorithm result does not match the previously stored data related to the entity, outputting, using the computer system, an empty result.
2. The method of claim 1, wherein the at least two of the plurality of identifiers comprises at least one from the group comprising: rural address information, city-style address information, hint information, name information, gender information, and moving date information.
3. The method of claim 1, wherein the previously stored data related to the entity comprises a delivery point code.
4. The method of claim 1, farther comprising:
determining, using the computer system, whether a format of the access record matches a format used to store the previously stored data related to the entity, prior to utilizing the cryptographic algorithm to process at least two of the plurality of identifiers in the access record.
5. The method of claim 4, further comprising enhancing the access record, using the computer system.
6. The method of claim 5, wherein enhancing the access record includes:
formatting at least one of the plurality of identifiers in accordance with a standard.
7. The method of claim 6, wherein the standard comprises one of a group comprising: a name formatting standard, an address formatting standard, and a number formatting standard.
8. The method of claim 5, wherein enhancing the record includes:
generating a variant to at least one of the plurality of identifiers; and
associating the variant with the record.
9. The method of claim 1, farther comprising:
retrieving, using the computer system, previously stored secondary data reflecting the entity; and
if the cryptographic algorithm result matches the previously stored data related to the entity, outputting, using the computer system, the secondary data with the result indicating the match.
10. A system for processing data comprising:
a receiver for receiving an access record having a plurality of identifiers, the access record corresponding to an entity;
a processor, communicatively connected to the receiver, adapted for:
transforming an identifier from the access record into a pre-determined standard representation;
utilizing a cryptographic algorithm to process at least two of the plurality of identifiers in the access record to form a cryptographic algorithm result corresponding to previously stored data related to the entity, wherein the previously stored data related to the entity was stored according to an output of the cryptographic algorithm;
matching the cryptographic algorithm result with the previously stored data related to the entity;
if the cryptographic algorithm result matches the previously stored data related to the entity, outputting a result indicating a match; and
if the cryptographic algorithm result does not match the previously stored data related to the entity, outputting, using the computer system, an empty result.
11. The system of claim 10, further comprising:
a preprocessing module for determining whether a format of the access record matches a format used to store the previously stored data, prior to utilizing the cryptographic algorithm to process at least two of the plurality of identifiers in the access record.
12. The system of claim 11, wherein the preprocessing module is further adapted for enhancing the access record.
13. A computer system implemented method for storing entity data comprising:
receiving a record having a plurality of identifiers, the record corresponding to an entity;
transforming, using the computer system, at least one of the plurality of identifiers in the record into a pre-determined standard representation of the at least one of the plurality of identifiers;
utilizing a cryptographic algorithm to process, using the computer system, at least two of the plurality of identifiers in the record, including the pre-determined standard representation, to form a cryptographic algorithm result;
deriving, using the computer system, an index from the cryptographic algorithm result to indicate a location in a secure database; and
storing the entity data, using the computer system, in the secure database at the location determined by the index derived from the cryptographic algorithm result.
14. The method of claim 13, wherein storing comprises:
storing a plurality of portions of the entity data at multiple locations determined by multiple indices derived from the cryptographic algorithm result.
15. The method of claim 13, wherein the record comprises a name identifier and an address identifier.
16. The method of claim 13, wherein the entity data comprises an address of the entity.
17. The method of claim 16, wherein the address comprises an address of the entity expressed in an alternative format.
18. The method of claim 13, further comprising:
enhancing, using the computer system, the record prior to utilizing a cryptographic algorithm to process at least two of the plurality of identifiers in the record.
19. The method of claim 9, wherein the previously stored data comprises delivery information, and the secondary data comprises a hint to resolve ambiguity related to the delivery information.
20. The method of claim 1, wherein the empty result comprises result indicating that no previously stored data corresponding to the cryptographic algorithm result was found.
21. The method of claim 1, wherein the cryptographic algorithm comprises a hash algorithm.
22. The method of claim 8, wherein the at least one of the plurality of identifiers comprises a number expressed as a word, and the variant comprises a numeral.
23. The system of claim 10, wherein the empty result comprises a result indicating that no previously stored data corresponding to the cryptographic algorithm result was found.
24. The system of claim 12, wherein enhancing the access record includes:
generating a variant for at least one of the plurality of identifiers; and
including the variant with the access record.
25. The method of claim 16, wherein the address comprises a relocation address for the entity.
26. The method of claim 18, wherein enhancing the record includes formatting at least one of the plurality of identifiers in accordance with a standard.
27. The method of claim 18, wherein enhancing the record includes:
identifying a variant to at least one of the plurality of identifiers; and
associating the variant with the record.
28. The method of claim 18, wherein enhancing the record includes normalizing the record.
29. The method of claim 10, further comprising:
outputting the previously stored data.
Description
RELATED APPLICATIONS

This is a continuation of, and claims the benefit of, U.S. application Ser. No. 10/377,989, filed Feb. 28, 2003, which claims the benefit of U.S. Provisional Application No. 60/366,805, filed Mar. 21, 2002, both of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to database security, and more specifically, to a method and system for providing security in a database by providing partial access to database information in response to provided access information.

2. Background of the Invention

Present-day databases are protected from “data mining” (unauthorized copying of contents of the database) and unauthorized use (undesired access to the database) by a variety of means. Predominantly, entire databases are encrypted using an algorithm such as Data Encryption Standard (DES) or other private key/public key encryption algorithm so that access to the database requires knowledge of a key that permits decryption of the entire database.

A drawback of typical database encryption techniques is that once a user is permitted to access (decrypt) a particular database record, the user has access to the entire database. In some applications, it is desirable to restrict access to a database to a limited portion of the database. In the most restrictive sense, it is desirable to restrict access to only a single database element. For example, such security would be useful in delivery address translation systems for use by United States Postal Service (USPS) customers. Current federal statutes provide that the USPS cannot provide address lists to unrestricted and unlicensed agents, while individual address translations (from the old rural address system to the new city style address system) may be provided to anyone through a controlled process.

For the above reason, rural addresses that have been converted to a city-style address present an inconvenience in managing delivery operations. When using standard address matching software (known as a ZIP+4 engine) to standardize addresses, when a rural address is encountered, a cross-reference table: the Locatable Address Conversion System (LACS), must be used to convert the rural address to a city-style address. The ZIP+4 engine provides a full 11-digit ZIP code for a newer city-style address, but older rural addresses must be first converted to a newer city-style address using the LACS before an 11-digit ZIP code can be assigned. Since the LACS comprises an address lists the LACS cannot be generally distributed.

Typical database encryption does not provide an adequate solution for the above-described problem. Individual elements cannot typically be extracted without decrypting the database or providing a universal key and further, computation to extract small portions of the information can be quite involved as the large decryption polynomials must be computed over a significantly larger portion of the database (significantly larger than the stored element). Further, if database elements are individually protected, keys must be produced for every database element, resulting in an unworkable over-complicated system.

In the above-mentioned address translation application, as well as in many other protected database applications, a database protection scheme that protects all information other than information for which the corresponding access information is known (e.g., the street address of a particular customer for which the rural address is known) would be very useful. Retrieval software and a database could be supplied to anyone without enabling data mining or unauthorized access. Information could not be retrieved from the protected database without knowing the corresponding access information, but information could be retrieved knowing only the non-translated information.

Therefore, it would be desirable to provide a method and system for storing and retrieving information to and from a data store that provides protection of the entire database information and access to only a portion of the database information. It would further be desirable to provide a method for retrieving the information from a data store that has a relatively low computational burden. Finally it would be desirable to provide a method and system for storing and retrieving elements from a translating data store requiring only input of the non-translated information to retrieve the translation information.

SUMMARY OF THE INVENTION

The above objectives of data protection while incurring a low computational burden and requiring only entry of non-translated information to access data is accomplished in a method and system for storing and retrieving data. The method may also be embodied in a computer program product containing computer-readable program instructions for carrying out the steps of the method on a general-purpose or workstation computer system.

The method for storing data hashes a (generally public) piece of access information to generate a hashed result. The hashed result is then split into offset fields that are used as indices to a plurality of data stores. The input data for storage is split into data values as digits of the data according to a predetermined numeric base. The data values may be reordered before storing in the data stores by using a look-up table containing combinations of striping orders. An entry in the look-up table is selected via a field of the hashed result that selects a particular striping order. The reordered data is then stored in the corresponding data stores.

The method for retrieving data is similar in that the access information is again hashed to provide offsets and select the striping table entry if striping is used. The data values are retrieved via offsets of the hashed result and restored to the original order via the striping table entry. The original input data is reconstructed by computing the original stored data from the data values as digits of the input data according to the predetermined numeric base.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram depicting a computer system in which the present invention may be practiced.

FIG. 2 is a pictorial diagram depicting the structure of database information located in multiple data stores in accordance with an embodiment of the present invention.

FIG. 3 is a flowchart depicting operation of the system executing a storage method in accordance with an embodiment of the present invention.

FIG. 4 is a flowchart depicting operation of the system executing a retrieval method in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring now to the figures and in particular to FIG. 1, there is depicted a computer system 10 within which a method may be performed via the execution of program instructions forming a computer program product in accordance with an embodiment of the present invention. The method may employ program instructions located within a memory 19 of a workstation computer 14 and executed by a central processing unit 18 (CPU) and the data store of the present invention may be located entirely within a storage media 13A and memory 19. Alternatively, workstation computer 14 may be coupled via a network 11 connection for coupling workstation computer 14 to a network such as a local-area network (LAN), wide-area network (WAN) or the Internet. In a network implementation, the data store and/or program instructions for implementing the methods of the present invention may be located within a database server 12 coupled to a storage media 13B.

The method of the present invention provides inherent database security, permitting distribution of a program and data store to an end-user for execution on workstation computer 14 or access to the data store and execution of the program via the Internet or other network. Other combinations such as local-hosted program with remote data store, local data store with remote-hosted program are possible and should be understood to be variations in accordance with embodiments of the present invention.

The present invention provides a method and system that store database information in multiple data stores, which may be individual data files, segments within a single data file, data structures within a single section of a data file or arranged in some other data storage implementation as are commonly known in the art of data storage and retrieval. The structure behind the present invention provides security without encryption, as portions of a single database element are spread across the multiple data stores. The relationship between the locations of the portions of the database element is not encoded and is therefore not extractable. The locations of the portions of the database element rather encode the access information, so that by knowing the access information, the database element can be retrieved.

As such, the method and system of the present invention can provide security for data where access to a database element only has a one-to-one correspondence to another piece of information (access information). In particular, two applications for the data storage and retrieval method and system of the present invention are envisioned as applied to the requirements for privacy within USPS products. The first is a rural address to new 11-digit Delivery Point Code (DPC) conversion system. Upon receiving a rural address, the database retrieval system will return the unique 11-digit DPC, along with optional hint information used for verification and resolving multiple addresses that may be coded to a singe DPC.

The second application is a name and address to change of address information retrieval system. Upon receiving both a name and an address, the system will return a unique 11-digit DPC and an effective move date, along with optional hint information as described above. The above-described particular applications are important for USPS operations, but should not be construed as limiting the method and system of the invention, in the sense that the technology may be applied to many database security requirements and a broad range of data storage and retrieval applications. Extra information, which may be the hint information described above may be stored in the data stores along with the 11-digit DPC (and the move date for the change of address system). Although the following description illustrates a technique for numerically encoding numeric data (e.g., the 11-digit DPC), other encoding may be used for alphanumeric data or unencoded data may be stored in one or more of the data stores. The extra information may be the middle initial and gender code for verification, and the hint information may be a code as described above for resolving multiple addresses. Other information may be stored along with the DPC and effective move date. The data storage technique should not be construed as limiting the secure addressing features used to store and access the data.

Referring now to FIG. 2, the structure of database information located in multiple data stores in accordance with an embodiment of the present invention is shown. Access information 30, (for example, an old-style rural address or an address and name) is hashed using a Secure Hash Algorithm 31 (SHA-1). Details of SHA-1 algorithms are described in the “SECURE HASH STANDARD”, Federal Information Processing Standards Publication 180-1 issued by the National Institute of Standards and Technology (NIST), an agency of the U.S. government. The SHA-1 algorithm is typically used for producing a condensed version of a message for verification through a Digital Signature Algorithm (DSA). The condensed version of the message (the message digest) encoded in a digital signature can be compared to a message digest generated from a received for verification that the received message content is the same as the transmitted message content. The message digest is a 20-byte number that is typically used for signature/message verification, but will be used herein in a new manner to provide access to the data stores of the present invention.

The present invention uses the SHA-1 algorithm to produce a representation of the access information for the database element and not for the above-described original purpose of the SHA-1 algorithm. It should be understood that other algorithms may be used to produce the representation of the access information as used in the present invention and that use of the SHA-1 algorithm is a convenience and not a limitation of the present invention.

Access information 30 is generally pre-processed to standardize actual user input. For example, the case of alphanumeric characters may be adjusted to a single case, alphabetical representation of numbers may be converted to numeric representations, spaces may be removed, symbols and abbreviations may be standardized, etc. Given a standard access information 30, the SHA-1 algorithm 31 yields a hashed result 32 (hashed rural address in the example). The hashed result 32 of the exemplary embodiment comprises a 20-byte number. The 20-byte hashed result 32 is then split into five 4-byte fields that are used as offsets for retrieving information from 9 separate data stores 34. (The offsets are ANDed with a size of the corresponding data store minus one to yield an offset sized for the corresponding data store). Only data stores 1, 2 8 and 9 are depicted in the drawing for clarity (data stores 34A-D).

Data stores 34 vary in size and their size is determined in a build process that generates data stores 34 periodically to provide updates to the software implementing the method of the present invention. The maximum size of the data stores is 232 bytes but generally, the table sizes will not approach this number for data sets that are smaller (such as the above-described USPS application examples, where the data store sizes typically do not exceed 226 bytes). Further, un-hashed input information (access information) may be used to pre-select a set of data stores. For example, the first two digits of ZIP code information in the exemplary un-hashed access information may be used to select from amongst 100 sets of data stores 34 reducing the required size of data stores by a factor of 100. The size of data stores 34 as dictated by the above-described pre-selection is a system option that may be made selectable for a particular system customer or based on the memory size of a computer system executing program instructions in accordance with embodiments of the present invention.

Further, data stores are set in the exemplary embodiment to sizes corresponding to powers-of-two, and specifically to the power-of-two size that will be greater than or equal to 4 times the quantity of data values to be stored. The reason for the larger storage size is that the storage method of the present invention will allow collisions between SHA-1 results and the particular storage locations within a data store (i.e., part of the hashed result will be ignored), resulting in more than a one-to-one correspondence between SHA-1 results and data value combinations. Any conflicts occurring during generation of a particular one of data stores 34 will be marked at build time, thus providing a mechanism for avoiding conflicts during data retrieval by triggering generation of a replacement offset for the data store that returns a marker value. The conflict avoidance mechanism will be described in further detail below.

The fields extracted from hashed result 32 in the exemplary embodiment are 32-bit numbers, therefore 5 indices are available from 20-byte hashed result 32. The extracted fields are ANDed with the size of the associated data store minus one, yielding an offset sized to the associated data store size. When all of the fields have been used to generate offsets, hashed result 32 is itself hashed, again using the SHA-1 algorithm, and the resulting doubly-hashed element 32A is effectively concatenated with the original hashed element 32, yielding five more 4-byte offset fields. The above-described repeated hashing procedure can also be used and repeated as needed to avoid collisions indicated by collision flags in the data storage locations. Generating another hashed result 32 and doubly hashed result 32A, by repeating the hashing process permits eventual generation of a set of offsets that will not collide with existing data.

At least two hashed results, hashed result 32 and doubly-hashed result 32A are needed in the illustrated embodiment in order to yield at least the required 9 non-overlapping 4-byte offset fields. If overlapping fields are used (for example using a 2 byte overlap of each field) it is possible to provide 9 4-byte offsets from a single hashed result 32 in accordance with another embodiment of the invention.

Data values 35 stored at the offsets determined by the first 8 offsets correspond to digits of a number of a particular numeric base. However, to further secure the stored data from any possible mining or discovery and also to realize an even usage of individual data stores 34, the data is “striped” across data stores 34 when data stores 34 are populated, so the extracted data must be un-striped in order reconstruct the original data.

Striping look-up table and reordering 38 represents a process that uses the top eight bytes of hashed result 32 as an entry pointer to a look-up table. The look-up table contains all of the possible combinations of reordering of data values 35 amongst data stores 34. Data store 8 34D is depicted as being outside of the striping algorithm in FIG. 2, but may be included as well.

The top 8-bytes of the 20 byte SHA-1 result (hashed access information 32 shifted right by 12 bytes) is divided by 5040 and the resulting modulo 5040 result (the remainder) is used to access a striping look-up table 38, provided as a file. However, any portion of hashed access information 32 could be used as an entry to striping look-up table 38, since access information 32 is quasi-random. Look-up table 38 provides 5040 combinations (7! combinations, where “!”, is the factorial operator and 7! is the number of possible combinations of the 7 tables). If eight tables are used, the divisor use is 40320=8! and the look-up table expanded to include 40320 combination patterns. Look-up table 38 is provided in the software that retrieves data from data stores 34, so that extracted data can be re-ordered at the time of retrieval. The result of the look-up operation is a re-ordering of the positions of the data values extracted by hashed access information 32 in the computation of the final data output. Once the order of the original stored data pattern across data stores 34 has been determined, they are assigned in the re-ordered pattern as values for computing the retrieved element (11-digit DPC).

Data values 35 from data stores 34 1-7 are combined (once re-ordered) in an add/accumulate fashion by multiplying each data value by a numeric base raised to an power corresponding to a digit location for each re-ordered retrieved data value 35 (or by accumulating data values starting with the most significant and successively multiplying by the numeric base until a result including all digits is assembled). The numeric base chosen for the exemplary embodiment is 254, which is chosen because there are 256 values that may be stored in 1 byte and two codes 0 and 255 are reserved for special use. The digits are determined by adding 1 to the remainders, reserving code zero for representing an empty location in the data store and code 255 for marking conflicting locations.

For example, the 11-digit bar code 38118-4034-83 yields the following base 254 digits:

38118403483/254=150072454 remainder 167; digit=168

150072454/254=590836 remainder 110; digit=111

590836/254=2326 remainder 32; digit=33

2326/254=9 remainder 40; digit=41

9/254=0 remainder 9; digit=10

which are then stored in respective data stores 34 1-7 as determined by the striping pattern retrieved from look-up table 38.

Data store 8 is a special data store for storing codes corresponding to “hint” information. Hint information is used for resolving ambiguities between some addresses located at the same 11-digit bar code location (such as addresses containing designators such as the 1/2 in some dual-unit street addresses, apartment designations in small un-coded multiple residence units, and other designations such as trailer, lobby, lot, penthouse, suite, upper/lower, etc.). Other information can be coded in data stores 34 (data stores 1-7) such as middle initial of addressee (for tie-breaker determinations when multiple addresses match or for verification of correct address) and information such as effective move-in date (for the change of address application) is inserted in and retrieved from the remaining data store locations for the change of address application. Data store 9 can be optionally incorporated to extend the amount of data or provide a location for storing information about a type of date.

Since the relationship between data values 35A-35D is determined only by the hashed access information, a high level of security is provided by the above described database arrangement. Without knowing beforehand what each access information (e.g., rural address or address and name) is it is impossible to mine data from the database. Striping further enhances the security of data stores 34.

Referring now to FIG. 3, a method for storing data is illustrated in accordance with an embodiment of the present invention. First, a database element is received for storage (step 41). The access information is pre-processed to eliminate possible duplicates (step 42). Next the access information is hashed using a SHA-1 algorithm to produce a hashed element (step 43) and the hashed access information is divided into a number of non-overlapping fields that are ANDed with the size of the corresponding data store to generate an offset for accessing each data store (step 44).

When all of the fields have been used to generate offsets, the hashed element itself is hashed using the SHA-1 algorithm and the resulting doubly-hashed element is concatenated with the original hashed element in order to yield more offset fields. The above-described procedure can be repeated as needed to avoid collisions indicated by collision flags in the data storage locations.

After the offsets are generated, the data values will be generated from the database element and stored. All existing data values in each of the data stores at the associated offsets are checked (step 45) to determine whether or not a conflict exists at that location (decision 46). If there is an attempt to store a second data value at a location that is already storing a data value, a replacement offset is generated for the particular data store by shifting the particular offset field right by one byte within the hashed access information. Step 45, decision 46 and step 47 are repeated until empty locations are found for all data values (the requirement of shifting is statistically rare and the entire hashed access information should never be exhausted by the shifting process). The data storage method also relocates the data that was previously stored at the location generated from the original offset and in practice, the set of offsets that will be used to store the data can be completely generated to check for conflicts before any data storage is performed. The conflict locations are marked with code 255 so that the data retrieval method can generate replacement offsets when marker 255 is encountered.

Once a complete set of useable offsets is determined, the data values are computed from the database element by the above-described method of successively dividing by a numeric base (step 48). The remainder of each division yields a value for each successive data store. Then, the data values are reordered according to the striping look-up table entry selected by the top eight bytes of the hashed access information (step 49). Finally the data values are stored in locations corresponding to the final offsets (step 50).

Referring now to FIG. 4, a method for retrieving data is illustrated in accordance with an embodiment of the present invention. First, access information is received and pre-processed to ensure a match to the access information used to store information in the data stores (step 61). Next the access information is hashed using a SHA-1 algorithm to produce a hashed element (step 62) and the hashed access information is divided into a number of non-overlapping fields equal to the number of data stores and ANDed with the size of the corresponding data store minus one to generate an offset for each data store (step 63). Then, the data values within each data store are retrieved with the corresponding offset (step 64). If a marker is found that indicates that a storage conflict occurred during storage (decision 65) the offset is shifted one byte to produce a new offset for that data store (step 66). Step 65 and step 66 are repeated until all of the offsets return valid data values. If any of the data values retrieved are null (indicating that data was never stored at that location), an empty result is returned (step 68) indicating that no stored database element corresponds to the access information provided. If all of the data values are non-null, the data values are re-ordered according to the striping table entry selected by the top 8 bytes of the hashed access information (step 70). Finally, the database element is assembled from the data values by multiplying by the numeric base used to generate the data store information (step 70) and the database element is thus returned in response to the provided access information.

While the invention has been particularly shown and described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form, and details may be made therein without departing from the spirit and scope of the invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4871903Jul 31, 1987Oct 3, 1989General Electric CompanyApparatus for rapidly accessing a large data base employing an optical disc reading system with multiple heads and track position compensation means
US5204966 *Mar 9, 1990Apr 20, 1993Digital Equipment CorporationSystem for controlling access to a secure system by verifying acceptability of proposed password by using hashing and group of unacceptable passwords
US5343529Sep 28, 1993Aug 30, 1994Milton GoldfineTransaction authentication using a centrally generated transaction identifier
US5420403May 26, 1992May 30, 1995Canada Post CorporationMail encoding and processing system
US5491752Sep 2, 1994Feb 13, 1996Digital Equipment Corporation, Patent Law GroupSystem for increasing the difficulty of password guessing attacks in a distributed authentication scheme employing authentication tokens
US5742807May 31, 1995Apr 21, 1998Xerox CorporationIndexing system using one-way hash for document service
US5819291Aug 23, 1996Oct 6, 1998General Electric CompanyMatching new customer records to existing customer records in a large business database using hash key
US5893120Jan 2, 1997Apr 6, 1999Nemes; Richard MichaelMethods and apparatus for information storage and retrieval using a hashing technique with external chaining and on-the-fly removal of expired data
US5903651May 14, 1996May 11, 1999Valicert, Inc.Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
US5933604Nov 5, 1996Aug 3, 1999Fujitsu LimitedNetwork resource monitoring system and method for providing notice of changes in resources in a network
US5966542Aug 10, 1998Oct 12, 1999Sun Microsystems, Inc.Method of operating a computer system
US6006200May 22, 1998Dec 21, 1999International Business Machines CorporationMethod of providing an identifier for transactions
US6289334Jan 31, 1997Sep 11, 2001Sun Microsystems, Inc.Apparatus and method for decomposing database queries for database management system including multiprocessor digital data processing system
US6289450May 28, 1999Sep 11, 2001Authentica, Inc.Information security architecture for encrypting documents for remote access while maintaining access control
US6308247May 22, 1997Oct 23, 2001International Business Machines CorporationPage table entry management method and apparatus for a microkernel data processing system
US6347376Aug 12, 1999Feb 12, 2002International Business Machines Corp.Security rule database searching in a network security environment
US6457012 *Jun 10, 1997Sep 24, 2002Pitney Bowes Inc.Method and system of updating address records utilizing a clientserver interface
US6516320Mar 8, 1999Feb 4, 2003Pliant Technologies, Inc.Tiered hashing for data access
US6754785Nov 30, 2001Jun 22, 2004Yan Chiew ChowSwitched multi-channel network interfaces and real-time streaming backup
US6763344Apr 14, 2000Jul 13, 2004International Business Machines CorporationMethod of and system for dynamically controlling access to data records
US7124408 *Jun 28, 2000Oct 17, 2006Microsoft CorporationBinding by hash
US7159119Jun 11, 2003Jan 2, 2007United States Postal ServiceMethod and system for efficiently retrieving secured data by securely pre-processing provided access information
US7302582Aug 21, 2001Nov 27, 2007United States Postal ServiceDelivery point validation system
US20010044783Feb 16, 2001Nov 22, 2001Seth WeisbergOn-line value-bearing indicium printing using DSA
US20020049670Mar 9, 2001Apr 25, 2002Hitachi, Ltd.Electronic payment method and system
US20030028783Jul 19, 2002Feb 6, 2003Mark CollinsSecurity system
US20030177021Dec 4, 2002Sep 18, 2003Rana DuttaTraceable business reply envelopes
US20040065598Jun 16, 2003Apr 8, 2004Ross David JustinAddress disambiguation for mail-piece routing
US20040111443May 3, 2002Jun 10, 2004Wong Thomas K.Apparatus and methods for caching objects using main memory and persistent memory
US20040128247Dec 16, 2003Jul 1, 2004Hitachi., Ltd.Bank system program, credit service program and IC card
US20040181670Mar 10, 2003Sep 16, 2004Carl ThuneSystem and method for disguising data
US20040210763Nov 6, 2003Oct 21, 2004Systems Research & DevelopmentConfidential data sharing and anonymous entity resolution
US20050060556Dec 31, 2003Mar 17, 2005Jonas Jeffrey J.Authorized anonymous authentication
US20050066182Mar 24, 2004Mar 24, 2005Systems Research & DevelopmentSecure coordinate identification method, system and program
CN1311486AFeb 28, 2000Sep 5, 2001金容杰Comprehensive search method for intermediat station information in electronic trade business
DE4421640C1Jun 21, 1994Aug 3, 1995Siemens AgHash addressing and storage for distribution and recovery of data
EP0381418A2Jan 29, 1990Aug 8, 1990International Business Machines CorporationA small fast lookup table for use in a data processing system
JP2001043135A Title not available
JP2002202938A Title not available
JPH08235040A Title not available
JPH11306676A Title not available
Non-Patent Citations
Reference
1"Application of DB2 Anonymous Resolution to the Financial Services Industry," Whitepaper of IBM Corporation, USA, May 2005 (17 pages).
2"DB2 Anonymous Resolution for Public Safety, Corrections, & Criminal Intelligence," Publication of IBM Corporation, USA, Feb. 2005 (2 pages).
3"DB2 Anonymous Resolution," Publication of IBM Corporation, USA, May 2005 (2 pages).
4"IBM DB2 Anonymous Resolution Version 3.8 Technical Information," Publication of IBM Corporation, USA, May 2005 (2 pages).
5Bellare at al., "Collision-Resistant Hashing: Towards Making UOWHFs Practical," Advances in Cryptology Conference (CRYPTO); Germany; vol. Conf. 17, pp. 470-484, (1997).
6Carter et al., "Exact and Approximate Membership Testers," ACM 10th STOC, pp. 59-65, (1978).
7Chinese Office Action, dated Nov. 21, 2008, for Chinese Application No. 03824536.1 (14 pages).
8First Examination Report from the Government of India Patent Office, dated Dec. 1, 2006 for Patent Application No. 577/KOLNP/2005 (3 pages).
9Friedrich, Andrew, "IBM DB2 Anonymous Resolution: Knowledge Discovery Without Knowledge Disclosure," Whitepaper of IBM Corporation, USA, May 2005 (23 pages).
10International Search Report for PCT/US01/26125, 3 pages mailed Mar. 26, 2002.
11Interview Summary, dated Nov. 30, 2004, for U.S. Appl. No. 10/459,013, filed Jun. 11, 2003 (2 pages).
12Interview Summary, dated Sep. 21, 2005, for U.S. Appl. No. 10/459,013, filed Jun. 11, 2003 (2 pages).
13Lohr, Steve, "I.B.M. Software Aims to Provide Security Without Sacrificing Privacy," The New York Times, May 24, 2005 (2 pages).
14Notice of Allowance and Allowability, dated Jan. 13, 2009, for U.S. Appl. No. 11/235,243 (6 pages) with Response to Office Action, filed Nov. 12, 2008, including listing of allowed claims (18 pages).
15Notice of Allowance and Allowability, dated Jul. 1, 2008, for U.S. Appl. No. 10/377,989 (5 pages), with Response to Office Action, filed Aug. 15, 2005, including listing of allowed claims (10 pages).
16Notice of Allowance and Allowability, dated Jul. 15, 2009, for U.S. Appl. No. 11/368,445 (6 pages), with Reply to Office Action, filed Nov. 14, 2008, including listing of allowed claims (19 pages).
17Notice of Allowance and Allowability, dated Jul. 17, 2007, for U.S. Appl. No. 10/344,990 (6 pages), with Response to Office Action, filed May 29, 2007, including listing of allowed claims (22 pages).
18Notice of Allowance and Allowability, dated Jul. 17, 2007, for U.S. Appl. No. 10/344,990 (6 pages).
19Notice of Allowance and Allowability, dated May 17, 2006, for U.S. Appl. No. 10/459,013 (16 pages), with Reply Under 37 C.F.R. § 1.111, filed Apr. 27, 2006, including listing of allowed claims (9 pages).
20Notice of Allowance and Allowability, dated May 4, 2009, for U.S. Appl. No. 10/377,989 (4 pages), with Response to Office Action, filed Aug. 15, 2005, including listing of allowed claims (10 pages).
21Office Action, dated Apr. 15, 2005, for U.S. Appl. No. 10/377,989, filed Feb. 28, 2003 (4 pages).
22Office Action, dated Apr. 4, 2006, for U.S. Appl. No. 10/344,990, filed Feb. 20, 2003 (8 pages).
23Office Action, dated Jul. 16, 2008, for U.S. Appl. No. 11/638,445, filed Dec. 14, 2006 (8 pages).
24Office Action, dated Jun. 26, 2009, for U.S. Appl. No. 11/231,787, filed Sep. 22, 2005 (7 pages).
25Office Action, dated Jun. 3, 2008, for U.S. Appl. No. 11/235,243, filed Sep. 27, 2005 (8 pages).
26Office Action, dated Mar. 24, 2005, for U.S. Appl. No. 10/459,013, filed Jun. 11, 2003 (14 pages).
27Office Action, dated May 26, 2009, for Japanese Application No. 2004-534223, filed Jun. 11, 2003 (9 pages).
28Office Action, dated May 8, 2009, for Chinese Application No. 03824536.1, filed Jun. 11, 2003 (8 pages).
29Office Action, dated Nov. 28, 2006, for U.S. Appl. No. 10/344,990, filed Feb. 20, 2003 (4 pages).
30Office Action, dated Oct. 27, 2005, for U.S. Appl. No. 10/459,013, filed Jun. 11, 2003 (12 pages).
31Office Action, dated Sep. 20, 2004, for U.S. Appl. No. 10/377,989, filed Feb. 28, 2003 (4 pages).
32Office Action, dated Sep. 3, 2004, for U.S. Appl. No. 10/459,013, filed Jun. 11, 2003 (12 pages).
33PCT International Preliminary Examination Report, completed May 6, 2003, for International Application No. PCT/US01/26125 (4 pages).
34PCT International Preliminary Examination Report, mailed Nov. 12, 2003 for International Application No. PCT/US03/06672 (4 pages).
35PCT International Search Report, dated Mar. 26, 2002, for International Application No. PCT/US01/26125 (4 pages).
36PCT International Search Report, dated May 23, 2003, for International Application No. PCT/US03/06672 (5 pages).
37PCT International Search Report, dated Oct. 17, 2003, for International Application No. PCT/US03/18412 (7 pages).
38PCT Written Opinion, dated Aug. 2, 2004, for International Application No. PCT/US03/18412 (5 pages).
39PCT Written Opinion, dated Feb. 13, 2003, for International Application No. PCT/US01/26125 (4 pages).
40PCT Written Opinion, dated Sep. 7, 2006, for International Application No. PCT/US03/12711 (8 pages).
41Supplementary European Search Report, dated Feb. 17, 2009, for European Application No. 03739087.9-1525 (3 pages).
Classifications
U.S. Classification707/747, 713/190, 715/205, 713/171, 709/203, 709/201, 707/781
International ClassificationG06F17/30
Cooperative ClassificationG06F17/30949, G06F21/62
European ClassificationG06F17/30Z1C, G06F21/62
Legal Events
DateCodeEventDescription
Mar 14, 2013FPAYFee payment
Year of fee payment: 4
Apr 20, 2010CCCertificate of correction